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Products of VDH Products B.V. (5)

A75 gauge

FC 785-PC

MC 585

MC 785-SC

PROBA 4

Worldwide
For more than 30 years, VDH Products BV develops en produces mechanical and electronic instruments for measuring of temperature, pressure and relative humidity. The company has grown to a modern customer orientated organization with loyal clients throughout Europe, North and South America, Australia and Asia.

Leaders in temperature, pressure and relative humidity

No nonsense
A highly motivated team of about 100 engineers and technicians that works with the latest machinery and production techniques, ensures a high quality product certified to ISO specifications. Our main office and factory are located in Roden, the Netherlands, with a subsidiary in Kempen, Germany. A characteristic of our team is a no-nonsense, market-oriented approach to many control applications.

Development and testing
For the benefit of continuous innovation, VDH Products has a well equipped purpose built Research & Development Laboratory. Our highly qualified hard- and software engineers are using the most up-to-date techniques and dedicated software programs to design and develop our own printed circuit boards, embedded software, housings and front plates. The test facility laboratory is equipped with a climate control room and EMC test equipment, which enables us to meet the requirements of current CE regulations and any new demands required for the industry.

Prototyping
Prototyping To keep the time-to-market as short as possible, the production department is involved in an early stage of new developments. This phase of prototyping generates important information, so that a product is technically easier to fabricate. In case of series-production, enormous efficiency advantages can be reached. The production process as a whole is set up efficiently and flexible, so that, if desired, large or small series can be produced.

Pick and place robots
State-of-the-art pick and place robots are used to place SMD-components with an amazing speed precisely on the printed circuit boards. This production technique minimizes manufacturing faults, in order to ensure a high quality and reliable product. Mechanical instruments and housings are produced in our special equipped production facility with its CNC-driven working stations.

Delivery and after sales
VDH Products focuses its attention on reliable delivery, offering excellent after sales service. Our fully computerized order processing system ensures that all components for manufacturing are available on time to meet production and delivery requirements. Our dedicated after sales team ensures that our clients are taken care of properly after delivery service.

VDH Products manufactures standard instruments for rail, panel and wall mounting (to DIN norms).
Moreover, VDH Products has the disposal of her own special department for manufacturing switchboards
and control panels to client specific requirements.

Electronic Instruments
Wherever temperature, pressure and relative humidity is measured and regulated, the products of VDH Products are applied. The development and production of these instruments takes place under direct management of VDH Products, as well as the production of printed circuit boards and front plates. The customers logo can be imprinted on the front.

Mechanical Instruments
Mechanical Instruments Since its foundation, VDH Products produces pressure gauges and thermometers of all kinds and sizes. These instruments are also being used in the cooling and climate control, the process technology and the manufacturing machinery. The customers logo can be imprinted on the dial. Next to the wide range of mechanical products, VDH Products also has a whole range of electronic sensors.

A75 gauge

The A75 pressure gauge has been developed for pressure measurement of ammonia compressors.

The pressure gauge has a stainless steel housing and is filled with glycerine for reliable operation and long life. The seal between the plastic window and the housing prevents leakage by means of a bayonet catch with sealing ring.

A connection nipple is fixed to the housing in a unique way making external connection screws unnecessary. This gives extra protection against leakage caused by vibration.

Surges that can occur due to temperature differences of the glycerin are automatically compensated for by the special bellows. A safety blow-out plug is fitted to the top of the gauge to guard against explosions.

The measuring element is of stainless steel contemned in a bourdon tube argon arc welded to a large stainless steel junction.

The measuring element is thermally and mechanically underrated allowing a 25% out of range safety margin.

The pressure gauge can be delivered in several sizes and formats with a choice of connection sizes and couplings.

The instrument scale is calibrated as standard for R717 temperature scales and the dial can be provided with company logos.

FC 785-PC

The FC 785-PC is specially developed for economical storing of fruit, such as apples and pears. The thermostat is equipped with separate counters to count the number of cool pulses and the total cooling time.

The thermostat can be deliverd for wall mounting or panel mounting.

Besides the controlling of the cooling, also the fan and defrost are controlled by the FC 785-PC. Defrost can be a natural defrost, electric defrost or hot-gas defrost.

The thermostats can be connected in a network. When hot-gas defrost is selected, the defrost will first start when one of the other rooms is cooling. When none of the thermostats are cooling the defrost will wait. If this takes too much time, one of the other thermostats will be start the cooling to make hot-gas.

The thermostat has two operation modes. In the cool down phase the cooling is started on request. This means that the cooling will start as soon as the room temperature is too high. In the storing phase the cooling is on relay base. This has the big advantage that only a small refrigeration capacity is required. The relay time is adjustable from 0 till 90 minutes.

The FC 785-PC has a network connection for read-out and data logging on the Alfanet PC software.

MC 785-SC

The MC 785-SC is a step controller, which controls maximal 8 compressors and 8 condensing fans based on the measured suction and discharge pressure and its setpoints.

The controller can be adjusted so that the compressors will switch on and off by calculating the best capacity or that the running hours from all the compressors will be as equal as possible.
It is possible to use compressors with different capacities. The MC 785-SC will make a calculation what the best possible combination is to keep the required suction pressure.
The condensing fans can be switch on and off in a fixed sequence or to keep the running hours as equal as possible.
Compressors and fans can be put into a maintenance position.

To safeguard the control it is possible to set:

a minimum and maximum pressure alarm

a minimum and maximum pressure failure

a minimum and maximum temperature alarm

a minimum and maximum temperature failure

It is also possible to connect external alarms. As soon as an external alarm occurs, the particular compressor or fan will be taken out of control.

On the MC 785-SC a super-heat alarm can be adjusted to avoid that liquid will be come into the compressor.

All adjustments can be protected by using a password.

The MC 785-SC has a network connection for read-out and data logging on the Alfanet PC software.

PROBA 4

The PROBA 4 is the latest model from the well known ripening computer.

One of the advantages of the PROBA 4 is, that the control pcb’s can be installed into a central switchpanel and the control panel is only an option. This means that long cables are not necessary which will result in an easy installation and less disturbing.

With the optional control panel it is possible to readout the room temperature and to change the set point. It is also possible to stop a program and to start the stand-by mode. This is important if the server crashes or the network is damaged.
The normal operation will be taken place on the pc.

The pc software should be installed on a server and can be used with every pc which on the network. The pc should have a browser with java.

The pc software can control a maximum of 100 PROBA’s 4. If necessary, it is possible to make more locations. Each location can contain 100 controllers.

Ripening programs will be made by using a graph. In this graph it is very easy to make adjustments. Not only in default programs but also in running programs. Set point changes can take place with a ramp, with a step. or with a combination of these two. It is possible to make as many set point changes per day as you want.